Circuit-closing device



Nov. 1, 1927. 1,647,347

K. A. EKBERG CIRCUIT CLOSING DEVICE Filed July 30, 1925 f 1 VENTORlPatented Nov. 1, 1927. v TEDQJSTAT'ESI ,PATENZF; caries.

on NEW Yemen. Y., Assreiaoia-cr one-seam an E. norma "KARL AUGUSTEKBERG,

LUND, OF BROOKLYN, IIEVZ"YGR-K.

Y CIRCUIT-CLOSING,nnvien.

Applicationhfil ed Tu'ly e0, 1925.

, This invention relates to switches for closing electric ClICLLlES,such switches being particularly designed for the actuation of burglarand hold-up alarms.

One important object of the present invention is to provide animprovedgeneral construction of switchior this purpose adapted to beactuated either manually or by the foot. l Y

A second importantobject of the invention for latching the switch is toprovide means 111 closed position and holding it against accidentalopening.

Figurell is a perspective View of the improved switch. a

Figure 2 is a perspective View ofacontrolling deviceused in connectionwith said switch. p v

Figure 3 is anend View of the switch as shown in Figure 1.

In carrying out my invention 10 designates a baseboard of insulatingmaterial upon which are fastened the lugs 11 of substantially springy' Sshaped clips'12 having forwardly curvinglips 13 in whichare held theends of a tube or tread 14, suitable stems 15 being designed to preventthe frontwise displacement of the tube 14 when the stems 15 standupright as shown in Figures 1 and 3,

these stems having integral rods'16 serving as pintles, encasedinbrackets 17, for the purpose of allowing stems 15 to be turned downtoallow the displacement of the tube when tread upon by a persons foot.

In the tube 14 is an electrical cable or conduit 18 holding twistedtogether the wires that lead to the coils to be hereinafter described.The circuit maker and breaker proper consists of the handle 23 securedto a lug 24 forming part of a knife switch 25 carrying the contactelement 27 secured by a fastener 26 to blade or switch 25. A coil spring28 supports the lug 24 underneath, the blade 25 being fulcrumed on thepin 29 secured in a bracket 30 connected to the baseboard 10. The spring28 surrounds a stud 29 on the baseboard 10. A fixed contact 31 iscarried by the member 32 secured to baseboard 10, this contact 31 beingengageable by the contact element 27 of the switch blade 25. A device ismounted on the baseboard 10 which is designed to separate the switch 25from contact 31 independently of the tube 14. This device consists of anarm 36 formed integrally upon a Serial No. 46 934.

knuckle.34trunnioned upon the crossrod o ii a staple '33 secured intothe, baseboard1Q. I

A lu 35 is also inte rall tormedu on" the {'3 2:

knuckle 34" and isdisposed at right angles to the arm 36. In theposition of this device shown 111 Figure 4 the lug 35 is up, holding upthe switch blade 25in a mannerto separate the contact element 27 fromthe contact 36 thus opening thecircuit. In this position it will be seenthat the handle or. arm 36 lies down on the face of the baseboard 10..'When the arm is raised the knuckle turnsand this brings the lug 36 downto'horizontal position, in which position the switch is set forcontrolled operation thru the displaceable' tube 14.

If a burglar or bandit enters any room 7 wherein is installed the deviceshown in F1 gure 4 or its equivalent, it will be observed :thatthedevice 'will be within easy reach of ;T

the foot oi the person approached by the burglar. lt hen the burglarcommandsthe attendant totl row up. his or her hands tliis is down butthe foot of the person'intimig dated depresses the tube 14, displacingthe same as shown in Figure 12, whereupon the tube 14 no longer pressesdown upon the handle 23 of the switch against the tension of depressedspring 28; now when the tube 14 is thus displaced the spring 28 relapsesand throws up the handle 23 of the switch at its outer end causing theinner end of switch 25 to lower and engage the contact 36 thusclosing'the circuits The bandit may now be in the act of committing adepredation within the room, without any knowledge of what is set intoactionby the displacement of the tube 14, which he may not see. a

An electrical circuit is maintained in the usual way so that upon theclosingoi switch controlled circuit an alarm may be conveyed.

There has thus been provided a simple and eflicient device 01' the kinddescribed and for the purpose specified.

It is obvious that minor changes maybe made in the form and constructionofthe invention without departing from the material spirit thereof. Itis not, therefore, desired to confine the invention to the exact formherein shown and described, but it is desired to include all such asproperly come within the scope claimed.

W hat I claim and seek protection on is 1. A circuit controlling devicecomprising 'switch'to closed position, a handle projecting from theswitch, a pedal operated bar normally'engaging the switch to hold thesame open, displaceable latch means movable independently of andengaging the bar for holding the bar against movement to release thehandle, and a releasable locking element engaging said swltch to preventclosing thereof upon displacement of 'said bar.

3. A circuit controlling device comprising a normally open switch, aspring urging the switch to closed position, a handle projecting fromthe switch, a base supporting said switch, a pair of spaced hook membersfixed to the base on opposite sides of the switch, and a bar removablyengaging said hook to restrain the switch from closing under theinfluence of said spring.

4'. A circuit controllin device com arisin I a normally open switch, aspring nrgingthe switch to closed position, a handle projecting from theswitch, a base supporting said switch, a pair of spaced hook membersfixed to the base on opposite sides of the switch, a bar removablyengaging said hood to restrain the switch from closing under theinfluence of said spring, and a pair of latches pivotally mounted onsaid base adjacent said hook members to swing along side of and awayfrom'said bar on the side of the bar toward which it is moved forrelease from the hook members;

5. A circuit controlling device comprising "a normally open switch, aspring, urging the switch to closed position, a handle projecting fromthe switch, a base supporting said switch, a pair of spaced hook membersfixed to the base on opposite sides of the switch, a bar removablyengaging said hook to restrain the switch from closing under theinfluence of said spring, a pair of latches pivotally mounted on saidbase adjacent said hook members toswing along sidefo'f and away fromsaid bar on the side of the bar toward which it is moved for releasefrom the hook members, and a latch member pivoted to the base below theswitch and having an arm engageable with the switch upon the latchmember being turned 'to one position whereby closing of the switch isprevented independently of the removal of the bar.

In witness whereof he has hereunto set his hand and. aflixed his seal Ju'ly,:1925.

, KARL AUGUSTEKBERG. 1,. 8.

this sixth day of

